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Superb talent
I usually think about the pre 80s engineers, scientists mathematicians and architects who had to do their calculations and drawings on paper wakitumia mkono. Real MVPs
Before the age of Transistors there was the Slide Rule. This was the computer of them days and even upto to the Mid 1980s
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The slide rule is used primarily for multiplication and division, and also for functions such as [SIZE=7][COLOR=rgb(184, 49, 47)]exponents, roots, logarithms, (Hapa ni Noma Kabisa) [/SIZE]and trigonometry, and typically not for addition or subtraction. Though similar in name and appearance to a standard ruler, the slide rule is also not meant to be used for measuring length or drawing straight lines.
In High school we had one mounted on the wall of Physics Lab, I learnt to use it out of curiosity an it was fantastic especially for logs